Unclear if explosion result of airstrike or explosives detonating within the warehouse.

At least 20 dead including Iranian officers.

Update 1725ET: There is at least one purported video of the attack on Aleppo that suggests it was an airstrike…Other sources claiming ISIS launched an attack on Assad forces and allied Shiite militias in outskirts of Al-Mayadeen city, east of Deir Ezzor

5-Hezbollah’s @C_Military1: news of Israeli strike in southern Aleppo countryside and in southern Syria inaccurate. “These rumors being circulated to raise morale of terrorists, which was brought low after failure of tripartite aggression on Syria.” http://t.me/C_Military1/15706 …

According to unconfirmed reports from the Syrian Observatory for Human Rights, there have been a number of casualties following the strike. It remains unclear if those killed were Syrians or Iranians. If the latter, Iran may soon be in a state of war with Israel.

The alleged Iranian airbase was first disclosed in late February, when Fox News published images showing a military base northeast of Syria’s capital. According to the report, Iran’s Al Quds force is operating the post.

While it is too early to determine who launched the attack, since none of the western forces have claimed responsibility, the most likely party is Israel which as a reminder, was also the first to strike Syria last Monday, almost a week before the US-coalition forces also unloaded on Syria.